A sample of carbon-rich stars (C-stars) in the Small
Magellanic Cloud (SMC) was selected from the combined 2MASS and
DENIS catalogues on the basis of their colour. This
sample was extended to include confirmed C-stars from the
Rebeirot et al. (1993) spectroscopic atlas. In this combined
sample (N = 1149), a smaller number (N = 1079) were found to have
MACHO observations. For this sub-sample, light curves were
determined and 919 stars were found to have high quality
light-curves with amplitudes of at least 0.05 mag. Of these
stars, only 4% have a well-defined single period – most of
these have multiple well-defined periods, while 15% have highly
irregular light-curves. The distribution of the logarithm of the
period versus magnitude, colour, period ratio (if applicable), and
amplitude was analyzed and compared with previous works. Variable
C-stars are distributed in three sequences: B, C, and D from Wood
et al. (1999), and do not populate sequences with periods shorter
than . Stellar ages and masses were estimated
using stellar evolutionary models.

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